Shank and bit punch



June 13, 1939. Q c. PEARsoN vSHANK AND BIT PUNCH Filed May 9, 1958 3 Sheets-Sheet 1 ATTORNEY.

June 13, 1939.

G. C. PEARSON SHANK AND BIT PUNCH Filed May 9, 1938 3 Sheets-Sheet 2 53 INVENTOR.

@um CPa/"so/z .g ATTORNEY.

Oo b- (0 WJ v Cn N Q In? m mm Ns.

mi.' g vm W V y lill I- f N f om w J 2 \\vw|| I a -www I @v E m WI il June 13,l 1939. G. c. PEARSON 2,162,667

SHANK AND BIT PUNCH Filed May 9, 1938 v 3 Sheets-Sheet 3 INVENTOR ATTORNEY.

Patented June 13, 1939 g UNITED STATES( PATENT y oFFlcE SHANK kAND BIT PUNCH Grustavv C. Pearson, Denver, Colo., assignor to Gardner-Denver Company, Quincy, Ill., a corporation of Delaware 7 Claims.

This invention relates to improvements in shank and bit punches and is more particularly directed to the means for feeding the punching mechanism to and from the Work.

The invention includes a pneumatically operated punch similar to that disclosed in the patent to Pearson, No. 1,797,918 of March 17, 1931, in which it will be observed that the punch is driven into the work and removed therefrom by a reciprocating hammer, all of which is quite common.

A further object of the invention lies in the provision of a feeding mechanism for a punch of the type described wherein a part of the feeding mechanism serves as the means for supporting the punch.

Still another object of the invention lies in the provision for a manually actuated mechanism for controlling both the feeding mechanism and the operation of the punch.

Further objects of the invention will hereinafter appear, and to all of these ends the invention consists of the features of construction, arrangement of parts, and combination of elements, substantially as hereinafter fully described and claimed in the speciiication and shown in the accompanying drawings, in which:

Figure 1 is a longitudinal sectional view taken through the center of the punch and its feeding mechanism showing some parts thereof in elevation.

Figure 2 is a view similar to Figure 1 but showing the mechanism moved to the position assumed after the bore of thework has been opened by the reciprocating punch.

Figure 3 is a sectional view taken on the line of Figure 2.

Figure 4 is a sectional view taken on the line i-- of Figure 1 but showing the manually actuated valve in a position permittingthe rearward movement of the punching mechanism and the withdrawal of the punch from the steel. Y

Figure 5 is a view similar to Figure 4- showing the manually actuated valve in its second functioning position permitting the forward movement of the mechanism.

Figure 6 is a vertical sectional View taken on the line 6 5 of Figure 7, and

Figure '7 is a top plan View of the valve operating lever and showing in dotted lines the manner of connecting the manually operated lever with the reciprocating distributing valve.

Briey, the invention hereinabout to be described is directed to Ypneumatically operated means for opening the bores in hollow objects such as the bore in drill steel. During the sharpening and the forming of shanks on such steel the usual bore serving as a passage of cleansing fluid becomes closed by the swaging action of the Sharpener. It is, therefore, the

- purpose of this invention to provide means for opening such bores by the introduction of novel and efficient means for moving the punch-into and out of the work. Speciiically, the invention disclosed includes a support having a xed bar or rod which forms the stationary piston of the feeding mechanism and through the operation of a manually controlled distributing valve motive fluid is admitted to one or the other side of a piston carried by such a bar and being received Within the cylinder formedintegral with the punch mechanism. Operation of the control valve causes the punch to be advanced toward the work and upon completion of the bore forming operation the valve is moved to its second position permitting the return of the mechanism upon the fixed bar or rod and the Withdrawal of the punch from the steel.

Referring to the drawings in detail, there is provided, as indicated by the numeral `5, a vertically extending face plate adapted to be bolted to the side of a drill sharpening mechanism. This face plate is provided with an outstanding arm S vforming a part of a longitudinally extending trough or guide member l, the front end of which terminates in an upwardly extending arm 8, While the rear end terminates in a similar arm 9.` Both arms 8 and 9 are provided with openings, the iirst receiving therein a sleeve I and tted within this sleeve I0 and the opening formed in the rear arm 9 is a horizontally disposed rod II, the intermediate portion of which is provided with an integral flange I2 upon each side of which is positioned one-half of a piston element I3. In order to hold the rod II in position with `respect to the upstanding arms 8 and 9 there is provided a suitable key I4 serving to lock the bar against movement with respect to the sleeve I0.v

The piston I3 is receivable within a cylinder I5, the ends of which are closed by elements I6 and I'I, each being fitted with a suitable bearing I8 within which the piston rod II snugly nts.

As further disclosed, the lower wall of the cylinder I is provided with a projection I9 receivable Within the guide element 'I formed with the support 5.

As disclosed in Figure 1 it will be observed that this projection I9 has an opening 20 through which passes a coil spring 2 I, the front end being secured to a pin 22 abutting the end face of the projection I9 While the rear end of the spring is receivable Within a second bore 23 formed in a cross piece positioned at the end of the trough shaped member 'I. Likewise, the spring 2| is secured to a second pin 24 overlapping the bore 23. The purpose of this spring being to assist in the return of the punching mechanism to its initial position and also toy maintain the mechanism in s uch a position when not in use.

mechanism embodying a reciprocating piston 26 adapted to strike a suitable tappet 21 within which the usual punch pin 28 for opening the bores is detachably secured.

'This hammer mechanism may be of any preferred structure and it may be of a valve or a` valveless type. Operating fluid for the hammer being provided through a suitable flexible hose 28 leading to the backhead 30 of the hammering mechanism. Various parts `of both the feeding mechanism and the hammering mechanism are maintained in their correct relation to each other by suitable side rods.

To support the steel during 1the advancing of the pin 28 there is provided a casting 3| having an upstanding yoke 32 within which is reversibly arranged and maintained by a setscrew 33 a guide element 34 having a central opening 35 through which the pin 28 passes during its working period. One face of the guide element 34 is provided with suitable recesses to receive the cutting edges of a drill bit 36, while the other face is cone-shaped to centralize 'the shank end of a steel when opening the bore thereof.

The casting 3| is further provided with a depending portion 31 and as shown in Figures 4 j and 5 this depending portion has movable therein a reciprocating distributing valve 38 for controlling the flow of fluid through parallel passage- Ways 39 and 43 formed in the rod II. The rst passageway 39 extends vbeyond the, furthermost side of the piston 'I3 and communicates with the interior of the cylinder I5, thus upon admission of fluid pressure into the cylinder and upon the rear face of Vthe piston rearward movement of the punching mechanism is accomplished.

The second passageway '4B likewise extends through the rod |I and opens into the cylinder I5 at a point in advance of the front face of the piston I3. Therefore, upon the admission of uid into the cylinder through this passage forward movement of the punching mechanism is accomplished.

The distributing valve 38 is movable within a bore arranged horizontally of the casting 3I, and surrounding the bore, adjacent its ends, are annular grooves 42 and 43, the first communicating with the passageway 39, while the second is in communication with the passageway 40.

Each end of the reciprocating distributing valve 38 has suitable passageways whereby either the passageway 39 or the passageway v4|'l might be opened to atmosphere. Thus, as shown in Figure 4, the passageway is opened to atmosphere through a small port 44, while the passageway 39 can be opened to atmosphere through the ports 45 as shown in Figure 5.

The casting 3|, as shown in Figures 1 and 2, has an outstanding annular flange 46 forming upon its front face a cup like structure Within which is rst placed ashock absorbing disc 41 and then a pair of metal discs 48 which cooperate with a ring 49 receivable within an annular groove 5 formed adjacent the end of the rod I|. A second shock absorbing disc 5| is positioned over the discs 48 and maintaining all of these elements in place is a cap or closure 52 secured to the casting 3| by suitable bolts 4|.

From this structure just described it will be observed that any ljar imparted to the piston rod Il during the starting or stopping and operating periods ofthe .punchA is4 reduced by the shock absorbing discs 41 and 5| and prevented from being transmitted to the rod supporting means. It will be observed that suicient movement of the rod with respect to its support is permitted without disturbing the fluid passageways connecting the two.

To move the distributing valve 38 from one functioning position to another there is provided as a part of the cap 52 a Vertical bore 53, and receivable therein is a shank 54 forming a part of an operating handle 55. The lower end of this shank 54 is squared as indicated at 56 and has positioned thereover an outwardly or horizontally disposed arm 51 which is receivable within a slot 58 formed in the protruding end of the valve 38. Forming a guide for this arm or lever 51 is an outstanding support 58 formed integral with the casting 3|.

As shown in Figures 4 and 5 the distributing valve 38 is intended to control the flow of fluid to and from the passageways 39 and 40. Fluid to these passageways is receivable through a poppet valve 68 formed in the lower portion of the casting 3| and provided with a stem 6I engageable with either side of a V 62 formed in the valve element 38. Thus, it will be seen that upon the movement of the distributing valve 38 the poppet valve will be first moved from its closed position to an open position, as indicated in Figure 4 or Figure 5. Motive iluid is admitted into the poppet valve chamber 63 through a suitable supply 64.

The hose 2S or flexible connection, as previously referred to, serving to convey motive fluid to the backhead of the hammer mechanism has its free end connected to the depending portion of the casting 3| and with a bore 65 thrown into communication with the supply 64 upon the opening of the poppet valve 60. Thus it will be observed that when the distributing valve 38 is moved from a neutral to a functioning position the poppet valve 68 opens and at the same time motive fluid is permitted to pass through either one of the passageways 39 or 40 and at the same time sets in operation the hammer mechanism for the punch. At the same time either the passageway 39 or 40 is opened to atmosphere through one of the ports 44 or 45 formed in the ends of the distributing valve 38.

Assuming now that the mechanism herein described is positioned upon a drill Sharpener or a suitable support and the operator is desirous of opening the bore within the bit end of a steel, the bit of the steel is positioned against the guide element, as shown in Figure 1, and held thereagainst either manually or by suitable pneumatically operated clamps generally provided for such purpose. The operator then grasps the valve handle 55 moving the distributing valve 38 to such a position that communication will be established between the supply and the passageway 4U extending through the rst half of the feed bar II, thus admitting pressure fluid into the cylinder I5 and at the same time the passageway 39 is opened to atmosphere through the port 45. In this position, the punch mechanism as a whole is moved forwardly against the tension of the spring 2| and at the same time motive iluid is admitted into the cylinder 25 of the hammering mechanism, thus setting in motion the reciprocating hammer 26, striking the tappet 21 and imparting the necessary movement to the pin 28 for advancement into the steel. During the reciprocation of the pin 28 the mechanism as a whole is fed forwardly vand such movement continues until the bore of the bit end of the steel is properly opened, after which the operator moves the control valve 38 to the second of its functioning positions whereby motive fluid is permitted to pass from the supply through the passageway 39 to the rear face of the piston I3,

thus returning the punching mechanism to its initial position and during this return movement the continued reciprocation of the piston 26 serves to impart necessary jars to the pin 28 so that it might be withdrawn from the steel. It is, of course, understood that in this return movement the piston 26 during its reciprocatlon does not strike the tappet 21 merely imparting vibration to the mechanism. Such is common and fully described in the patent previously reierred` to. Upon the return oi the punching mechanism to its initial position the coil spring 2| serves to maintain such a position after the moving .of the distributing valve 38 to its neutral position, whereupon the passage of air through either the passage 39 or 40 is interrupted and likewise the flow of iiuid to the punching mechanism. The next operation is that of opening the bore in the shank end of the steel whereupon the reversible element 34 in the yoke 32 is changed so that its cone-shaped face is reverse to that shown in Figure l, and when in such a position the end of the shank is inserted in the cone, automatically centralizing the shank so that its center will fall in line with theV opening 35 in the element 311.` Advancement of the punch mechanism in the same manner as that previously explained causes the borev in the shank end of the steel to be penetrated by the pin 28 after which the punch is returned to its initial position as described. It is quite apparent that with the structure here described, and particularly the shock absorbing discs, that during the operation of' the punch all shock incident to the starting and stopping of the punch will be eliminated from the punch proper.

From the foregoing it is thought that the construction, operationand many advantages of the herein described invention will be apparent to those skilled in the art without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacricing any of the advantages of the invention.

What I claim is:

1. In a shank and bit punch, a pin for forming the bore within the ends of a steel, a hammering mechanism supporting said pin and serving to drive the same in and out the steel, a cylinder integral with said mechanism, a bar forming a support for said mechanism and having a piston midway thereof receivable within the cylinder, passageways for the flow of motive fluid through the bar and communicating with the interior of the cylinder on each side of the piston, and a distributing valve directing motive uid to either side of the piston for moving the mechanism in a selective direction upon the bar.

2. A shank and bit punch comprising a fluid actuated motor and a pin for forming the bore within the ends of the steel, said motor driving said pin into and out of the steel, acylinder formed integral with the motor, a horizontally disposed bar having a piston receivable within the cylinder, said bar adapted to support said motor during its movement thereon, fluid passageways through the bar communicating with the cylinder on each side of the piston, and manually controlled means for selectively admitting' motive fluid into the cylinder on either side of the piston for moving the motor and pin to and away from the steel.

3. A shank and bit punch comprising a fluid actuated motor and a pin for forming the bore within the ends of a steel, said motor driving said pin into and out of the steel, a cylinder formed integral with the motor, a horizontally disposed bar having a piston receivable within the cylinder, said bar supporting said motor during its movement thereon, iiuid passageways through the bar communicating with the cylinder on each side of the piston, and manually controlled means for selectively admitting motive fluid to either side of the piston for movement of the motor longitudinally upon the bar and at the same time setting in operation the motor.

4. A shank and bit punch comprising a fluid actuated motor having a pin for forming the bore of a steel, a cylinder forming a part of said motor, a support including a bar extending through the cylinder, a piston on the bar, passageways through the bar communicating with the cylinder on either side of the piston, a distributing valve controlling the flow of motive fluid active upon either siderof the piston for moving the motor and pin to and away from the steel, a Valve controlling simultaneously the flow of fluid to the motor, and a part of the motor enf gageable with the support for maintaining the motor in correct alignment during its movement upon the bar.

5. A shank and bit punch comprising a fluid actuated hammering mechanism active upon a.`

pin for forming the bore within a drill steel, a support, a bar carried by the support, resilient means permitting movement of the bar with respect to the support, a cylinder integral with said mechanism through which said bar extends, a piston aflixed to the bar and positioned within the cylinder, said bar having passageways extending from one end thereof to each side of thel piston for the flow of motive fluid therethrough, a Valve on the support controlling the flow of fluid through said passageway, and said bar supporting the mechanism during its movement and eliminating the transmission of shock during the operation of the mechanism.

6. A shank and bit punch comprising a fluid actuated hammering mechanism .active upon a. pin for forming the bore within a drill steel, a cylinder integral With the mechanism, a bar extending through the cylinder, a support for the bar, a piston aixed to the bar within the cylinder, said bar and cylinder constituting the means for moving the hammering mechanism with respect to the steel, and resilient means permitting movement of the bar with respect to its support.

'7. A shank and bit punch comprising a fluid actuated hammering mechanism active upon a pin for forming the bore within a drill steel, a base, a bar carried by the base and supporting the mechanism, a cylinder included in thek mechanism and through which the bar extends, said bar and cylinder serving to move the mechanism upon the former, and resilient means permitting limitedmovernent of the bar with respect to the base.

GUSTAV C. PEARSON. 

